doc.: Submission July 2008 Jérôme Rousselot, CSEMSlide 1 Project: IEEE P Working Group for Wireless Personal Area Networks (WPANs) Submission Title: [WiseMAC – HA : A Flexible, Scalable, Robust and Ultra Low Power MAC Protocol for Medical BANs] Date Submitted: [10 July, 2008] Source: [Jérôme Rousselot] Company [CSEM SA] Address [Jaquet-Droz 1, CH-2002 Neuchatel, Switzerland] Voice:[ ], FAX: [ ], Re: [If this is a proposed revision, cite the original document.] [If this is a response to a Call for Contributions, cite the name and date of the Call for Contributions to which this document responds, as well as the relevant item number in the Call for Contributions.] [Note: Contributions that are not responsive to this section of the template, and contributions which do not address the topic under which they are submitted, may be refused or consigned to the General Contributions area.] Abstract:WiseMAC-HA, a MAC protocol designed specifically for body area networks, is presented and evaluated. Its design guarantees robustness against interferences and node failures, flexibility in network topology, scalability in network size, coexistence with independent networks and an ultra low power consumption. Purpose:[Description of what the author wants P to do with the information in the document.] Notice:This document has been prepared to assist the IEEE P It is offered as a basis for discussion and is not binding on the contributing individual(s) or organization(s). The material in this document is subject to change in form and content after further study. The contributor(s) reserve(s) the right to add, amend or withdraw material contained herein. Release:The contributor acknowledges and accepts that this contribution becomes the property of IEEE and may be made publicly available by P

doc.: Submission July 2008 Jérôme Rousselot, CSEMSlide 2 WiseMAC – HA A Flexible, Scalable, Robust and Ultra Low Power MAC Protocol for Medical BANs

doc.: Submission July 2008 Jérôme Rousselot, CSEMSlide 3 Outline Targeted BAN Applications and Requirements Ultra Low Power MAC Protocols The WiseMAC High Availability Protocol Performance Evaluation Conclusion

doc.: Submission July 2008 Jérôme Rousselot, CSEMSlide 4 Targeted Applications Medical Body Area Networks Continuous measurements [ESENSE 2006] Main Requirements Low Power Scalability Robustness Coexistence

doc.: Submission July 2008 Jérôme Rousselot, CSEMSlide 5 Ultra Low Power MAC Design Radio in Tx Mode Idle Listening Overhearing Useless Talking Signaling Overhead Collisions Radio in Rx Mode Types of Energy Waste MAC Protocol Families

doc.: Submission July 2008 Jérôme Rousselot, CSEMSlide 6 Ultra Low Power MAC Design Radio in Tx Mode Idle Listening Overhearing Useless Talking Signaling Overhead Collisions Radio in Rx Mode Types of Energy Waste MAC Protocol Families No Synchronization More Scalable

doc.: Submission July 2008 Jérôme Rousselot, CSEMSlide 7 WiseMAC Ultra Low Power MAC Scheme Periodic Sampling Link-local Synchronization Only WiseNET: an ultralow-power wireless sensor network solution, IEEE Computer, Enz et. al., WiseMAC: An Ultra Low Power MAC Protocol for Multi-hop Wireless Sensor Networks, El-Hoiydi, Decotignie, AlgoSens 2004.

doc.: Submission July 2008 Jérôme Rousselot, CSEM Slide 8 WiseMAC Ultra Low Power MAC Scheme WiseMAC Deviations from Ideality High Traffic: low cost of wake-up preamble Low Traffic: only the cost of sampling N = 10 LMAC Crankshaft S-MAC SCP-MAC WiseMAC Ideal Node Store Forward Node Low Power Medium Access Control Protocols for Wireless Sensor Networks, Jérôme Rousselot, Amre El- Hoiydi and Jean-Dominique Decotignie, European Wireless Conference 2008 (EW 2008), June 2008, Prague, Czech Republic. (Texas Instruments CC 2420 radio transceiver)

doc.: Submission July 2008 Jérôme Rousselot, CSEMSlide 9 MultiChannel WiseMAC Three Channels

doc.: Submission July 2008 Jérôme Rousselot, CSEMSlide 10 MultiChannel WiseMAC Advantages Ultra Low Power Robustness to Interference Scalability with network size Flexibility (star and mesh topologies) Low latency WiseMAC High Availability Have some nodes switch to an interoperable mode that does not exhibit limited throughput = CSMA (IEEE Non Beacon Enabled Mode) Drawbacks Inefficient Broadcasts Limited Throughput Sub-optimal for heterogeneous networks

doc.: Submission July 2008 Jérôme Rousselot, CSEMSlide 11 Power Consumption CSMA WiseMAC-HA - sensor S-MAC - sensor WiseMAC Ideal - sink Ideal - sensor 5 sensor devices 16 bytes data packets 4 bytes Ack messages FM-UWB (250 kbps) 8 mW Rx 4 mW Tx Sink Sensor S-MAC - sink

doc.: Submission July 2008 Jérôme Rousselot, CSEMSlide 12 Latency WiseMAC CSMA Traffic limited, not device limited Sink Sensor

doc.: Submission July 2008 Jérôme Rousselot, CSEMSlide 13 Conclusions WiseMAC-HA Robust and reliable: Detect-and-Avoid interferers Ultra Low Power for all nodes: no need to synchronize Scalable: traffic limited Coexistence: the protocols fairness allows simultaneous operation of independent networks Throughput and Latency vs. Energy trade-off Flexibility to decide mode changes Flexibility to accomodate other operating modes